KVM: Implement perf callbacks for guest sampling

Below patch implements the perf_guest_info_callbacks on kvm.

Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 686492ed3079..82be6dac3d25 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3654,8 +3654,11 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
 
         /* We need to handle NMIs before interrupts are enabled */
         if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
-            (exit_intr_info & INTR_INFO_VALID_MASK))
+            (exit_intr_info & INTR_INFO_VALID_MASK)) {
+                kvm_before_handle_nmi(&vmx->vcpu);
                 asm("int $2");
+                kvm_after_handle_nmi(&vmx->vcpu);
+        }
 
         idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;